This standard applies to metallic OUTLET BOXES@ flush-DEVICE BOXES@ FLOOR BOXES@ CONCRETE BOXES@ EXTENSION RINGS@ covers@ CONDUIT BODIES@ BAR HANGERS@ bar-hanger assemblies@ and all accessories whose principal function is for support of boxes. The products covered by this standard are intended for installation in accordance with the National Electrical Code (NEC)@ NFPA 70@ the Canadian Electrical Code (CEC)@ Part I@ and the Standard for Electrical Installations@ NOM-001-SEDE. In Canada@ CONDUIT BODIES are not evaluated as OUTLET BOXES; they are fittings. Requirements in this standard for CONDUIT BODIES intended for use as OUTLET BOXES do not apply in Canada. This standard also applies to marine application metallic OUTLET BOXES@ flush-DEVICE BOXES@ special purpose boxes@ EXTENSION RINGS@ and covers. This standard also applies to marine products intended for installation in accordance with the manufacturer's instructions and the applicable requirements of the United States Coast Guard (USCG)@ IEEE Recommended Practice for Electric Installation on Shipboard@ IEEE Standard 45; the American Boat and Yacht Council (ABYC); the Standard for Pleasure and Commercial Motor Craft@ NFPA 302; and the Canadian Electrical Code (CEC)@ Part I. This standard does not apply to cabinets and cutout boxes@ boxes@ and covers intended for use with raceway systems for surface wiring other than rigid or flexible conduit or electrical metallic tubing. This standard does not apply to boxes having a volume of more than 1640 cm? (100 in?)@ other than multiple-gang boxes@ flush-DEVICE BOXES@ and CONDUIT BODIES intended for the larger trade sizes of conduit. This standard does not apply to cover plates for flush-mounted wiring devices. This standard does not apply to OUTLET BOXES or OUTLET BOX COVERS for use in hazardous (classified) locations as defined in the National Electrical Code (NEC)@ NFPA 70@ the rules of the Canadian Electrical Code (CEC)@ Part I@ and the Standard for Electrical Installations@ NOM-001-SEDE.